<template>
  <div>数字：{{ num }}</div>
  <button @click="add">+1</button>
  <button @click="dec">-1</button>
</template>

<script>
export default {
    data() {
        return {
            num: 1,
        };
    },
    methods: {
        add(){
            this.num++;
        },
        dec(){
            this.num--;
        },
    },
};
</script>

<style>

</style>